Mayday Mayfly
Mayday Mayfly is Gilbert Rowley's signature trapped-emerger mayfly pattern that rides flush in the film and fools selective trout during mayfly hatches. It supports Mayday Mayfly fly pattern, Gilbert Rowley mayfly, trapped emerger, and selective trout dry fly searches.
Imitates: Trapped mayfly emergers (BWO, PMD, Callibaetis, sulphur)
Quick Reference
- Best Sizes
- #16-22
- Best Season
- Spring through fall
- Best Conditions
- Glassy glides, tailouts, spring creeks, and selective rise water
- Water Temp
- 48-66°F
- Recommended Tippet
- 5X-6X
How to Rig It
Fish it alone to picky risers or trail it 12-18 inches behind a visible dry.
How to Present It
Long drag-free drift in the feeding lane; let it sit low and stuck in the film.
Why It Works
Trout key on stuck emergers because they cannot escape — the Mayday profile mimics that helpless silhouette better than upright duns.
History
Designed by Utah fly tier Gilbert Rowley to solve refusals during technical mayfly hatches across western tailwaters and spring creeks.
Pro Tip
When duns get refused, switch to a Mayday in the same size and color before changing tippet.
Frequently Asked Questions
Who designed the Mayday Mayfly?+
Utah fly tier Gilbert Rowley designed it as a flush-film trapped emerger for selective trout.
Not sure if Mayday Mayfly is right today?
Get a fly recommendation based on live water temp, flow, sky, and time of day for any river in the US.
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